Set test size of //tests:test Bazel test
Set test size of //tests:test Bazel test

Without this:

    INFO: Analyzed 33 targets (1 packages loaded, 12 targets configured).
    INFO: Found 32 targets and 1 test target...
    INFO: Elapsed time: 0.905s, Critical Path: 0.66s
    INFO: 3 processes: 3 linux-sandbox.
    INFO: Build completed successfully, 3 total actions
    //tests:test                                                             PASSED in 0.1s
      WARNING: //tests:test: Test execution time (0.1s excluding execution overhead) outside of range for MODERATE tests. Consider setting timeout="short" or size="small".

dtolnay/cxx,dtolnay/cxx,dtolnay/cxx,dtolnay/cxx